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What does a marine mechanic do?
The tasks of a marine mechanic are to maintain the vessel's engines and mechanical systems. They are responsible for ensuring they run at optimal efficiency and perform repairs as needed.
What is the density of marine grade plywood?
Marine grade plywood has a density of 300 to 400 kilograms per cubic metre, depending on the type. ( I found this answer on google inside 20 seconds, by the way. Learn how to use the web, guys!)
What are the 5 kinds of lubrication systems and state clearly their application and how they function?
SPLASH The splash system is no longer used in automotive engines. It is widely used in small four-cycle engines for lawn mowers, outboard marine operation, and so on. In the splash lubricating system, oil is splashed up from the oil pan or oil trays in the lower part of the crankcase. The oil is thrown upward as droplets or fine mist and provides adequate lubrication to valve mechanisms, piston pins, cylinder walls, and piston rings. In the engine, dippers on the connecting-rod bearing caps enter the oil pan with each crankshaft revolution to produce the oil splash. A passage is drilled in each connecting rod from the dipper to the bearing to ensure lubrication. This system is too uncertain for automotive applications. One reason is that the level of oil in the crankcase will vary greatly the amount of lubrication received by the engine. A high level results in excess lubrication and oil consumption and a slightly low level results in inadequate lubrication and failure of the engine. A splash lubrication system is provided for motor vehicle transmissions and comprises an oil sump in the bottom portion of a case. The case accommodates a transmission shaft provided with gears which are immersed in the oil at least partly when the said oil sump is filled completely. In order to prevent the synchronizing mechanism from being blocked by cold and, consequently, very viscous oil in the presence of extremely low operating conditions--a condition which could lead to unsynchronized faulty gear shifting operations and, thus, damage to the transmission, the oil sump is connected with a cavity into which oil is drawn from the oil sump under low operating temperature conditions of the transmission. To this end, preferably, an expansion body is arranged in a cavity in the transmission shaft which contracts under cold conditions, and the cavity is connected. Combination Splash and Force Feed In a combination splash and force feed (fig.), oil is delivered to some parts by means of splashing and other parts through oil passages under pressure from the oil pump. The oil from the pump enters the oil galleries. From the oil galleries, it flows to the main bearings and camshaft bearings. The main bearings have oil-feed holes or grooves that feed oil into drilled passages in the crankshaft. The oil flows through these passages to the connecting rod bearings. From there, on some engines, it flows through holes drilled in the connecting rods to the piston-pin bearings. Cylinder walls are lubricated by splashing oil thrown off from the connecting-rod bearings. Some engines use small troughs under each connecting rod that are kept full by small nozzles which deliver oil under pressure from the oil pump. These oil nozzles deliver an increasingly heavy stream as speed increases. At very high speeds these oil streams are powerful enough to strike the dippers directly. This causes a much heavier splash so that adequate lubrication of the pistons and the connecting-rod bearings is provided at higher speeds. If a combination system is used on an overhead valve engine, the upper valve train is lubricated by pressure from the pump. FORCE FEED A somewhat more complete pressurization of lubrication is achieved in the force-feed lubrication system (fig.). Oil is forced by the oil pump from the crankcase to the main bearings and the camshaft bearings. Unlike the combination system the connecting-rod bearings are also fed oil under pressure from the pump. Oil passages are drilled in the crankshaft to lead oil to the connecting-rod bearings. The passages deliver oil from the main bearing journals to the rod bearing journals. In some engines, these opening are holes that line up once for every crankshaft revolution. In other engines, there are annular grooves in the main bearings through which oil can feed constantly into the hole in the crankshaft. The pressurized oil that lubricates the connecting- rod bearings goes on to lubricate the pistons and walls by squirting out through strategically drilled holes. This lubrication system is used in virtually all engines that are equipped with semi floating piston pins. Full Force Feed In a full force-feed lubrication system (fig.), the main bearings, rod bearings, camshaft bearings, and the complete valve mechanism are lubricated by oil under pressure. In addition, the full force-feed lubrication system provides lubrication under pressure to the pistons and the piston pins. This is accomplished by holes drilled the length of the connecting rod, creating an oil passage from the connecting rod bearing to the piston pin bearing. This passage not only feeds the piston pin bearings but also provides lubrication for the pistons and cylinder walls. This system is used in virtually all engines that are equipped with full-floating piston pins. kinds of Lubrication Differing widely in viscosity, specific gravity, vapor pressure, boiling point, and other properties, lubricants also offer a wide range of selection for the increasingly varied needs of modern industry. But whatever their derivation or properties, the purpose of lubricants is to replace dry friction with either thin-film or fluid-film friction, depending on the load, speed, or intermittent action of the moving parts. Thin-film lubrication, in which there is some contact between the moving parts, usually is specified where heavy loads are a factor. In fluid, or thick-film, lubrication a pressure film is formed between moving surfaces and keeps them completely apart. This type of lubrication cannot easily be maintained in high-speed machinery and therefore is used where reciprocating or oscillating conditions are moderate.
How marine engine works?
The "engine" part of a marine engine is the same as any other kind of engine. The difference is the cooling system, and there are two kinds: raw water and enclosed. Raw water systems are used on outboards and small pleasure boats with inboard engines. The engine's water pump sucks water out of the lake, runs it through the engine and puts it back in the lake. This works with a minimum of parts, until you get into boats that run in salt water. Would YOU want ocean water running through your engine? Neither would yachtsmen with expensive diesels. The enclosed cooling system uses a heat exchanger. There's a tank on the boat with a radiator in it. The engine pumps coolant through the radiator just like it would the radiator on a car. A second pump pulls water out of the ocean and feeds it into the tank to cool the radiator. There's more maintenance in this system (you have to be sure saltwater scale isn't blocking the heat exchanger and you've got more water pumps to deal with) but it is more reliable than feeding raw water into the engine.
What grade of stainless steel is best for use in salt water?
316, A rugged, highly corrosion resistant, low magnetic stainless used in chemical plants worldwide. Best grade for salt water and marine applications.
What is the difference between marine diesel engines and diesel engines?
some marine engines are reverse rotation, Also marine engines are made from anti corrosive materials, they are heavy duty and can tolarate vibrations of your ship.
What is the difference between marine turbo engine and marine engine?
the difference is that one is turbocharged and one isnt,but both are marine engines. Keep in mind,there is a difference between marine and non-marine engines.
Where can you buy a marine diesel engine?
Marine Diesel engines can be bought from ebay which prices ranging from $287 to $1,134. Marine Diesels can also be purchased from 'tadiesels' which sells used marine diesel engines.
What has the author Edward Milton Bragg written?
Edward Milton Bragg has written: 'The design of marine engines and auxiliaries' -- subject(s): Marine engines
How are marine engines different from automotive engines?
Marine engines are almost always based on an automotive/ industrial counterpart. They are marinated to have a cooling system that uses the seawater to cool them directly or indirectly through a heat exchanger.
How you can take main bearing clearance marine engine?
the clearance is measured at the top of the bearing with the help of a feeler gauge
What are the practical applications of dual cycle?
its is used in marine engines
Which engines does a fram ph30 fit?
Chevy 4 cylinder engines and Chevy marine 4 cyl engines typically found in Bayliners, etc.
What degree does marine biology require?
A degree in marine biology or general biology.
What is Marine auxiliary engine do?
Auxiliary engines are any engines that are not main propulsion engines. They are used for generators, water pumps, air compressors, winches etc.
What does the company Mercury Marine manufacture?
Mercury Marine manufactures marine products such as engines, propellers, inflatable boats, services and parts for recreational, commercial and government use.
What has the author J Denholm-Young written?
J. Denholm-Young has written: 'Reed's guide to the use and management of yacht, trawler & launch engines including deck and auxiliary machinery' -- subject(s): Handbooks, manuals, Marine engineering, Marine engines, Steam engines
